Engine oil Mobil or ZIC

Ran quieter on 5-40 heavy duty diesel Mobil 1

Felt more powerful, but that may have been a perception from quieter and smoother power. Others on Saabnet reported the same.

If you're oil change is specified for longer, buy Mobil 1 in the correct spec grade and change it then, you will save money and use less, which will keep your cash in your pocket not the oil industry's.

Make sure to use dexos GM approved oil or that thing will start making weird noises. I’ve only used Mobil 1 and not had any issues. Stay away from the cheapest stuff. You might regret it later.

Im using zic sa vehicles namin. So far ok naman.

Mobil3000 5W-30 even boosted my oil pressure and helped with cooling.

140K '19 Tigi 2.0T, switched from Valvoline 5W20 Syn to Mobil 1 0W20 ESP (Dexos D). Changed oil due to oil consumption and secondary air injection DTC. The "latest" member of the Mobil 1 family touts lower emissions (less vapor in the PCV system).

Mobil1. Period. Years of personal experience. When I was in my 20's twenty years ago I was using Motul too because everyone else was and I didnt know any better. Try them out. Detergents, how clean the oil remains after each oil change and how smooth it runs were some deciding factors for me.

SK Zic 5W30 Diesel

I found Mobil 1 0W-40 to allow a lot more timing chain and lifter noise, especially at startup but even after, then switched to Castrol Edge 5W-40 and the noise suddenly wasn't there. I've used it ever since.

Syn 3 is garbage. I typically run mobil 1 full synthetic (twin cam) or motul and motul for other stuff since they have dedicated lines for primary, oil etc.